Download Evolution exam 1 File

SBC 174A
This is a partial sample paper for you to work through and covers the Evolution part of
SBC 174.
Section A:
In the full paper there 25 MCQs with 5 parts each (1 point for each part, negative marked, 0.5 for a wrong answer. Any part may be true or false. Answer all parts of all questions.
1 Macroevolution is the process
A when large organisms such as dinosaurs evolve.
B when “hopeful monsters” are created by multiple mutations in conjunction.
C where evolution of single traits occurs within a species.
D where new species originate in every single generation.
E that is also called runaway selection.
2 The 6th Great Extinction
A occurred at the end of the Jurassic.
B describes the end of the dinosaurs.
C describes the current rate of global species loss.
D is related to human activity.
E includes the loss of the dodo and many other endemic bird species on
isolated oceanic islands.
3 The ever-changing selection pressures that result from host-parasite coevolution
A could explain why some organisms reproduce sexually.
B can lead to selection for rare resistance alleles.
C can lead to selection for smaller female animals.
D are the reason why humans evolved intelligence.
E arise from the way that parasites are continually evolving to exploit their hosts, while
the hosts are evolving to resist the parasites.
4 Evolution.
A The theory of natural selection was proposed by Watson and Crick in 1959.
B Alfred Russel Wallace was a strong opponent of natural selection.
C Natural selection acts on phenotypic variation that is genetically inherited.
D Can occur through the effects of genetic drift.
E Occurs through the inheritance of acquired traits.
5 Genetic variation in a population.
A Can arise through recombination.
B Can arise through mutation.
C Can arise through mitosis.
D When crossing over occurs, offspring can end up with different combinations of alleles
on chromosomes than are found in either parent.
E Can arise through sexual reproduction.
Section B:
In the exam there will be two sets here to choose from and only one set should be
attempted. Here only part of one is provided, but this should provide an appropriate idea of
the style of question.
Write short notes on the following terms and giving examples where appropriate.
Each is worth 3 marks. You WILL be penalised if you write excessive amounts or
include numerous facts to attempt to include three that are correct.
Short answers (each is worth 3 marks unless stated).
What are alleles?
Why are the Amish a good model for genetic inheritance?
What is a parasitoid?
Section C:
In the exam there will be 5 or 6 of these (there are more in the SBC 174 paper than in the
174A paper). Here only part of one is provided, but this should provide an appropriate idea of
the style of question.
EMQs
Answer all parts of each question selecting the most appropriate answer in each case. Each
answer appears only once.
Sexual reproduction
For each question 1 to 5 below, select the single best answer from options a) - j)
a) sexual selection
b) parthenogenesis
c) conjugation
d) good genes hypothesis
e) postzygotic endomitotic isolation
f) hybrid incompatibility
g) paternal infertility
h) runaway selection hypotheses
i) immunocompetence
j) anisogamy
1. Extravagant traits indicate biological fitness (because less fit males would be less able
to afford such traits) – this notion is called the ….
2. Differential reproduction owing to variation in the ability to obtain mates.
3. “Virgin birth”: development of an organism from unfertilised eggs laid by females.
4. In Ciliates, the temporary fusion of two individuals to exchange genetic material.
5. Females prefer sexually attractive traits which they pass on to sons, which makes sons
more successful in mating success (because the sons in turn will also be more attractive to
females) – this notion is called the …